package moe.nea.firmament.util.render

import com.mojang.blaze3d.systems.RenderSystem
import io.github.notenoughupdates.moulconfig.platform.next
import org.joml.Matrix4f
import org.joml.Vector2f
import kotlin.math.atan2
import kotlin.math.tan
import net.minecraft.client.gui.DrawContext
import net.minecraft.client.render.BufferRenderer
import net.minecraft.client.render.RenderLayer
import net.minecraft.client.render.RenderPhase
import net.minecraft.client.render.Tessellator
import net.minecraft.client.render.VertexFormat.DrawMode
import net.minecraft.client.render.VertexFormats
import net.minecraft.util.Identifier

object RenderCircleProgress {

	fun renderCircle(
		drawContext: DrawContext,
		texture: Identifier,
		progress: Float,
		u1: Float,
		u2: Float,
		v1: Float,
		v2: Float,
	) {
		RenderSystem.enableBlend()
		drawContext.draw {
			val bufferBuilder = it.getBuffer(GuiRenderLayers.GUI_TEXTURED_TRIS.apply(texture))
			val matrix: Matrix4f = drawContext.matrices.peek().positionMatrix

			val corners = listOf(
				Vector2f(0F, -1F),
				Vector2f(1F, -1F),
				Vector2f(1F, 0F),
				Vector2f(1F, 1F),
				Vector2f(0F, 1F),
				Vector2f(-1F, 1F),
				Vector2f(-1F, 0F),
				Vector2f(-1F, -1F),
			)

			for (i in (0 until 8)) {
				if (progress < i / 8F) {
					break
				}
				val second = corners[(i + 1) % 8]
				val first = corners[i]
				if (progress <= (i + 1) / 8F) {
					val internalProgress = 1 - (progress - i / 8F) * 8F
					val angle = lerpAngle(
						atan2(second.y, second.x),
						atan2(first.y, first.x),
						internalProgress
					)
					if (angle < tau / 8 || angle >= tau * 7 / 8) {
						second.set(1F, tan(angle))
					} else if (angle < tau * 3 / 8) {
						second.set(1 / tan(angle), 1F)
					} else if (angle < tau * 5 / 8) {
						second.set(-1F, -tan(angle))
					} else {
						second.set(-1 / tan(angle), -1F)
					}
				}

				fun ilerp(f: Float): Float =
					ilerp(-1f, 1f, f)

				bufferBuilder
					.vertex(matrix, second.x, second.y, 0F)
					.texture(lerp(u1, u2, ilerp(second.x)), lerp(v1, v2, ilerp(second.y)))
					.color(-1)
					.next()
				bufferBuilder
					.vertex(matrix, first.x, first.y, 0F)
					.texture(lerp(u1, u2, ilerp(first.x)), lerp(v1, v2, ilerp(first.y)))
					.color(-1)
					.next()
				bufferBuilder
					.vertex(matrix, 0F, 0F, 0F)
					.texture(lerp(u1, u2, ilerp(0F)), lerp(v1, v2, ilerp(0F)))
					.color(-1)
					.next()
			}
		}
		RenderSystem.disableBlend()
	}


}